[Elecraft] RE: K2 #4039 - Distorted transmit audio
Hi, The distorted audio moves with the Control board, so either K2 can enjoy distorted transmit audio, if it has the faulty board fitted! Just to clarify point 3. The 12v rail seemed to modulate on both K2's when using either the faulty ** OR ** the working Control board! As this effect is the same for both K2's with either Control board. This would seem to indicate it is some other measurement (etc) effect, that we are seeing? Thanks again!!! Regards Nicolas Original posting. Hi, Following reports of poor transmitted audio, and aided by a fellow K2 owner we set about a little investigation. What happens.. Raspy, clipping?, (distorted by RF?), almost Dalek (For UK readers!!), sounding transmit audio. We checked the various board, joints etc, swapped things with the known working K2 and established.. 1. The issue is with the control board, when swapped, it gives the same fault in either K2. 2. No obvious component problems. 3. Another interesting observation on both K2's, was how the 12v rail modulates when you transmit? Any suggestions, where / what to look for on the control board, or other ideas? Thanks!!! Regards Nicolas www.m1hog.com --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.808 / Virus Database: 550 - Release Date: 08/12/2004 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] Re: K2 Muting
Hi Bob, Do you want to do SO2R with the 2nd K2? I have been running two K2s, SO2R using either TRLog or CT with an old laptop and a W4AN type homebrew switchbox. The laptop has only one serial port, so I switch the KIO2 lines with a multi-pole relay - not elegant, but it works. If that's what you're looking for, I'll send details. 73, Ken ZL1AIH ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] Re: Elecraft Digest, Vol 8, Issue 10
--- John W2XS wrote: The 42-foot wire received slightly lower signal reports than the inverted V, but most people said that they could still hear me fine on the wire. To my surprise, though, most people reported no real difference with and without the counterpoise. I don't know if this was a circumstance of my particular installation, but I would have thought that the counterpoise would make more difference. --- end of quote --- John, I've read in a number of places that the counterpoise should ideally be slightly longer than the antenna wire. Perhaps that is why little difference was noted. 73, Charlie N1AOK ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] RE: K2 #4039 - Distorted transmit audio
Nicolas, I would expect a bit of 'modulation' on the 12 volt line due to the resistance in the power supply leads and the connectors. If you find yours excessive, check all connections for the power leads and consider using a larger gauge wire (or use a better regulated power supply if the modulation is seen at the power supply terminals too.) I would suggest checking the 5 volt and 8 volt for any trace of 'modulation' too - a faulty regulator could cause your problem - Q1 (which drives the 8T line) could be another potential offender. U10A and Q8 and their associated components in the ALC area are other possible problem sources. 73, Don W3FPR - Original Message - The distorted audio moves with the Control board, so either K2 can enjoy distorted transmit audio, if it has the faulty board fitted! Just to clarify point 3. The 12v rail seemed to modulate on both K2's when using either the faulty ** OR ** the working Control board! As this effect is the same for both K2's with either Control board. This would seem to indicate it is some other measurement (etc) effect, that we are seeing? ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Re: Elecraft Digest, Vol 8, Issue 10
Charlie, John and all, One of the 'funny' properties about RF is that it will always find a (ground) reference somewhere - that may be from any wire, chassis, PC board or even your body. Whatever the RF finds convenient will be used as its ground reference. The idea of using a proper counterpoise is that one will assure an RF ground at the point the counterpoise is connected. To have that condition, the counterpoise must be an electrical 1/4 wavelength long and the far end must be isolated (just like the end of an antenna - actually an elevated resonant radial). The physical length will vary with placement of the wire (and a lot of other things too - just like an antenna will be influenced by nearby objects). A random radial wire can be tuned with lumped constant elements to create this RF ground too, and that is exactly what the 'artificial ground' boxes do. the really are 'antenna tuners for your ground wire'. BTW, a half wavelength wire connected to ground at the far end will behave just like a quarter wave that is open at the far end - think transmission line (and antenna wire) behavior. The bottom line message here is that all factors must be considered before one concludes that a counterpoise is or is not beneficial to a particular installation. 73, Don W3FPR - Original Message - --- John W2XS wrote: The 42-foot wire received slightly lower signal reports than the inverted V, but most people said that they could still hear me fine on the wire. To my surprise, though, most people reported no real difference with and without the counterpoise. I don't know if this was a circumstance of my particular installation, but I would have thought that the counterpoise would make more difference. --- end of quote --- John, I've read in a number of places that the counterpoise should ideally be slightly longer than the antenna wire. Perhaps that is why little difference was noted. 73, Charlie N1AOK ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Re: Elecraft Digest, Vol 8, Issue 10
On Dec 10, 2004, at 9:27 AM, W3FPR - Don Wilhelm wrote: One of the 'funny' properties about RF is that it will always find a (ground) reference somewhere - that may be from any wire, chassis, PC board or even your body. Whatever the RF finds convenient will be used as its ground reference. BTW, a half wavelength wire connected to ground at the far end will behave just like a quarter wave that is open at the far end - think transmission line (and antenna wire) behavior. Doesn't this cause a bit of an RF-philosophical problem? If one end of the half wave is supposed to determine RF ground, how does the RF know what's at the other end is also ground? I should think that simply grounding it to the earth would not do the trick if, as in your original message, the RF hasn't already "found" it as a convenient ground. best wishes, dave belsley, w1euy ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Re: Elecraft Digest, Vol 8, Issue 10
David, Sorry about the confusion. I was not proposing that the grounded halfwave was a practical solution - my intent was only to point out that the behavior of RF on a 'counterpoise wire' is not magic, but follows the same rules as other wires carrying RF, just like an antenna element, or one wire of a transmission line. There is no 'one solution' or one answer to such questions, we have to consider the behavior of all elements involved. The REAL answer is: "It all depends ..." 73, Don W3FPR - Original Message - On Dec 10, 2004, at 9:27 AM, W3FPR - Don Wilhelm wrote: One of the 'funny' properties about RF is that it will always find a (ground) reference somewhere - that may be from any wire, chassis, PC board or even your body. Whatever the RF finds convenient will be used as its ground reference. BTW, a half wavelength wire connected to ground at the far end will behave just like a quarter wave that is open at the far end - think transmission line (and antenna wire) behavior. Doesn't this cause a bit of an RF-philosophical problem? If one end of the half wave is supposed to determine RF ground, how does the RF know what's at the other end is also ground? I should think that simply grounding it to the earth would not do the trick if, as in your original message, the RF hasn't already "found" it as a convenient ground. best wishes, dave belsley, w1euy ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] [CONTEST] CQC Great Colorado Snowshoe Run (corrected)
N2CQ QRP Contest Calendar Correction: CQC Great Colorado Snowshoe Run WHEN: December 12, 2004 02:00 through 03:59 UTC (2 Hours) (Saturday evening, December 11, North America local time, 19:00 - 20:59 Mountain) http://www.cqc.org/contests/snow2004.htm Ken Newman Woodbury, NJ [EMAIL PROTECTED] ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Re: Elecraft Digest, Vol 8, Issue 10
A while back, Ron AC7AC designed, built, and kindly sent me a simple yet elegant rf current sensor that operates along with my DMM to give an accurate quantification of how my rig is delivering power to the radiator. More current equals more radiation. One thing it allows me to do is to calculate power out into a known load, and particularly relative to this discussion, it facilitates the ability to make comparisons between different antenna configurations, including the relationship between radiator and counterpoise. Instead of a 1/4 wl wire, I use an MFJ Artificial Ground to tune a wire for maximum current per given band. While measuring, one thing that surprised me was to discover that with my 86' EFW, the use of a properly tuned counterpoise didn't always increase the current to the radiator. For example, on 40 meters the use of a counterpoise helped to realize a substantial increase of current into the radiator, while on 80 meters I actually saw more current into the radiator with the counterpoise unhooked on that band. The effects on 30-10 were really fairly minimal or neutral in this regard. 73, Mychael AA3WF K2#1025 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] FS Ten Tec Delta 580 FS
Hi Folks,I have a TT 580 Delta with CW filter excess to my needs,I am offering it for 325 shipped,USA. it is in good working and in good shape cosmetically. It has WARC bands also,as always, the price is negotiable. Thanks and Feliz Navidad! John KF7OM 72' Fallon, Nv. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Re: Elecraft Digest, Vol 8, Issue 10
Mychael Morohovich wrote: Instead of a 1/4 wl wire, I use an MFJ Artificial Ground to tune a wire for maximum current per given band. While measuring, one thing that surprised me was to discover that with my 86' EFW, the use of a properly tuned counterpoise didn't always increase the current to the radiator. For example, on 40 meters the use of a counterpoise helped to realize a substantial increase of current into the radiator, while on 80 meters I actually saw more current into the radiator with the counterpoise unhooked on that band. The effects on 30-10 were really fairly minimal or neutral in this regard. Keep in mind that you are measuring the current in the radiator AT A PARTICULAR POINT. Due to the standing waves on the radiator, that current varies depending on where you measure it. Now, since the 'antenna' you are feeding consists of the counterpoise PLUS the radiator, tuning the counterpoise will change the current distribution on the whole system. So measuring the current at the original point on the radiator does not tell the whole story. Perhaps adding the counterpoise has moved the maximum current point away from the feedpoint (a desirable situation)? What you can do is listen to distant stations while connecting and disconnecting the counterpoise. That will test the overall effectiveness of the antenna. Of course, the counterpoise will also change the horizontal and vertical pattern of the antenna, so you will need to listen to a large number of distant stations to control for this effect! -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] Re: Elecraft Digest, Vol 8, Issue 10
Vic, K2VCO, wrote: Keep in mind that you are measuring the current in the radiator AT A PARTICULAR POINT. - The counterpoise is tuned for maximum current at the *rig*! The idea is that the more current flowing into the counterpoise for a given power output the lower the RF voltage at the rig. The objective is to provide the lowest impedance "RF Ground" at the rig. A well-tuned 1/4 wave wire does a very good job, of course. A 1/4 wave wire shows an impedance of about 35 ohms. Parallel several and you can reduce that proportionately. The problem is that in many situations it's not possible to carefully arrange even one resonant 1/4 wave wire, much less several. Many so-called grounds consisting of a random length wire thrown on the floor or a wire running several feet to a ground rod show an impedance at the rig in the hundreds of ohms, making the rig "hot" with RF. In that case a 35 ohm "ground" provided by a single tuned counterpoise is vastly superior for "grounding the rig". Will it change the efficiency of the antenna? Perhaps. If the antenna is an end-fed 1/2 wave wire presenting an impedance of perhaps 2000 ohms to the rig, the difference in radiation efficiency will be negligible. One can consider the two resistances in series: the ground resistance, 35 ohms in this example, and the radiation resistance of the antenna, 2000 ohms in this example. If .1 amps is flowing inn that circuit, the rig is putting out 20.35. Of that 20 watts, 0.35 watts is dissipated in the counterpoise and 20 is radiated. The advantage of the counterpoise in this case is to keep the RF voltage at the rig down. It will tend to "float" to a high RF potential if there's no ground and cause all sorts of problems. If the antenna is shortened to 1/4 wavelength, then the efficiency drops to 50% with equal current and power in the counterpoise and antenna. That sounds awful but that is, in reality a very respectable figure for such an antenna. Many short vertical antennas have efficiencies of much less than 50%. As the antenna is made shorter than 1/4 wave long (that's overall physical length, adding a loading coil doesn't help the efficiency - it only helps match impedances) the radiation resistance plummets, and with it the efficiency unless a really, really good ground system is used. That's the ultimate challenge with anyone using a "loaded" monopole of any sort. There simply is no "magic" answer to efficiency for physically small antennas - until we get some really cheap, really good room-temperature superconductors to make them from... Ron AC7AC ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] MFJ 4103
Hi Elecrafters, Does any one have any info on the MFJ miniature psu type 4103? Although it is a sealed unit I wish to adjust the output to keep my internal battery charged. The nominal output voltage is 13.8 and I wish to adjust to give 14.2 as measured by the K2. I think the unit could be carefully cut open and after adjustment sealed up again. Before starting on this exercise I thought I would check with your collective wisdom. 73 Max/ZL4vv ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
FW: [Elecraft] Attenuation at narrow bandwidths NOT!
Do overs! What I really proved is that the AGC circuit works really well. Nobody spotted the error in my Setup, I.E., AGC OFF not specified. I just reran the test with AGC off. Results are still excellent, but not as perfect as I reported yesterday. Bandwidth Setting Peak 0.00 -41 0.10 -35 0.20 -34 0.30 -31 0.40 -30 0.50 -29 0.60 -29 0.70 -29 0.80 -30 0.90 -31 1.00 -30 1.25 -32 1.50 -32 1.75 -33 2.00 -34 2.25 -32 2.49 -33 OP1 -36 My perception of "No Attenuation" comes from my standard practice of cycling between 0.90, 0.50 and 0.20 (-31, -29 and -34 respectively) plus the AGC working made me think it was flatter than it is. However, 5db isn't too bad if the S9+ interfering signal disappears. Dan / WG4S / K2 #2456 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Dan Barker Sent: Thursday, December 09, 2004 8:25 AM To: Elecraft Subject: [Elecraft] Attenuation at narrow bandwidths NOT! Don, you got me thinking. Why would you say something like that? My K2 filters are EXCELLENT! But, I decided to test it out to prove my belief. Test Setup: Freq 7.040. Mode CW Normal. Set FL4 width to 0.00 (FL4 has the BFO for a "reasonable" left skirt. I didn't want to change frequency, just bandwidth. Broadband noise source on ANT2, Antenna selector to ANT2. Spectrogram on Fixed Audio Out (top of AF pot). Peak Hold on, wait for the graph to "fill in". Measure the peak, and the amplitude of the -6db points for bandwidth calculation. Note: BWs above 1,200 hz have significant ripple (not unexpected). However these bandwidths are not particularly useful to me. I measured the peak as above, and measured the -6db points on the far right hump. The ripple is at most 10db, but I'd measure the -6db point of the next hump. Not that it matters anyhow at 2.49! I imagine anyone wanting really wide CW reception is going to use OP1 anyway. Repeat measurements with FL4 bandwidth 0.10 (or more) higher. After 2.49, use OP1. Finally, return FL4 bw to operating BW, in my case, 0.20. Verify trace is still centered on my sidetone (it was). Raw data available at ftp://ftp.visioncomm.com/k2filter.xls, anonymous, your email address, bin, get. As these numbers appear to powerfully demonstrate the extremely excellent job done by the designers, I'll be happy to compare notes with any K2 owner with less stellar performance. EVERY K2s filter plots should look this good. I'm not sure what to compare tho, to find a discrepancy. Wayne? Eric? Ideas?. As I normally S&P with the 0.90, and work heavy QRM at 0.20, the ZERO db attenuation is what I notice. If I lose AF volume with FL4, then I AM OFF FREQ. It's not my filter. Dan Barker / WG4S / K2 #2456 Summary: Bandwidth -6db Bandwidth Setting Peak Measured 0.00 -43109 0.10 -43133 0.20 -43158 0.30 -42178 0.40 -42200 0.50 -42231 0.60 -42263 0.70 -42292 0.80 -42352 0.90 -43421 1.00 -42450 1.25 -43663 1.50 -43897 1.75 -42 1231 2.00 -43 1574 2.25 -44 1894 2.49 -45 2103 OP1 -47 1784 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] MFJ 4103
On Sat, Dec 11, 2004 at 08:26:20AM +1300, Ron W wrote: > Hi Elecrafters, > Does any one have any info on the MFJ miniature psu type 4103? Although it > is a sealed unit I wish to adjust the output to keep my internal battery > charged. The nominal output voltage is 13.8 and I wish to adjust to give > 14.2 as measured by the K2. I think the unit could be carefully cut open > and after adjustment sealed up again. Before starting on this exercise I > thought I would check with your collective wisdom. > 73 > Max/ZL4vv I have one and it is a nice unit (no noise problems), but the output is not really high enough to charge the KBT-2. I measure 13.3 volts on the K2's internal display, while the KBT2 manual says the acceptable range is 13.6-14.0 volts. On a partially-discharged battery and after several days it brought the voltage from 11.1 to 12.4 volts, as measured on the K2's internal meter, which indicates that it partially charges the battery (I normally use a small linear supply, adjusted to 14.2 volts, which fully charges the battery). The 4103 is small and lightweight and suitable for travelling. I took it and my K2 to France earlier this year and when I unpacked, discovered that I had forgotten the power cord. Fortunately, the 4103 uses the same cord as desktop PCs, which is easily attainable practically anywhere. No switching is required when going between 120 and 240 volt mains systems. Unfortunately, it doesn't come with a schematic, so I don't know what is involved in modifying the unit for a higher voltage. If you are successful in raising the output voltage of the supply, please let the list know. 73, Bob N7XY ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] TT Delta 580
The radio has been sold thanks for the BW. 72 John KF7OM ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Antennas and counterpoise was Re: Elecraft Digest, Vol 8, Issue 10
Thanks for the good infoI am slowly learning. 73, Jim, AL7FS Ron D'Eau Claire wrote: -- Jim Larsen http://www.CSTAlaska.com/ http://www.AL7FS.us/ Anchorage, Alaska ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] Building Help in Florida
I have had a request from a new customer who would like to talk with an Elecraft customer and possibly get some help as he builds his K2/100. He is in the Boca Raton area and would like to talk with someone local. He may even need a little face-to-face help along the way. If you are interested please email me directly first, [EMAIL PROTECTED] Thank you and have a great weekend! Lisa ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Re: Elecraft Digest, Vol 8, Issue 10
Ron D'Eau Claire wrote: Vic, K2VCO, wrote: Keep in mind that you are measuring the current in the radiator AT A PARTICULAR POINT. - The counterpoise is tuned for maximum current at the *rig*! The idea is that the more current flowing into the counterpoise for a given power output the lower the RF voltage at the rig. The objective is to provide the lowest impedance "RF Ground" at the rig. Hi Ron, I agree. The post I was responding to included: For example, on 40 meters the use of a counterpoise helped to realize a substantial increase of current into the radiator, while on 80 meters I actually saw more current into the radiator with the counterpoise unhooked on that band. The effects on 30-10 were really fairly minimal or neutral in this regard. Mychael was using an RF current sensor to measure current into the radiator. My point was that tuning the counterpoise may have the effect of moving the high current point in the antenna system that includes the counterpoise and the radiator. I was making the point that his experiment of unhooking the counterpoise and measuring the current into the radiator did not indicate that the counterpoise was or was not improving antenna performance. Since his antenna was an unbalanced end-fed wire working against ground, the counterpoise was an essential part of his system. Tuning it would be expected to have an effect on performance. Of course, with a balanced or ground-independent antenna, no counterpoise should be needed. RF in the shack is indicative of imperfect balance or isolation. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Re: Elecraft Digest, Vol 8, Issue 10
Vic wrote: "I was making the point that his experiment of unhooking the counterpoise and measuring the current into the radiator did not indicate that the counterpoise was or was not improving antenna performance." - The method I used was to first tune the antenna with my KAT100 for a flat SWR, tune the counterpoise for max current at the rig, then tweak both until the KAT100 reported a flat SWR for the antenna while the Artificial Ground reported maximum current into the counterpoise. Using the rf sensor, I measured the current of the antenna [and counterpoise because I was curious] at a spot close to the back of the rig. I then removed the counterpoise, retuned the antenna for a flat SWR, and measured the current again for reasons of comparison. This showed me the amount of current that was going into a properly tuned antenna both with and without a tuned counterpoise in place. Mychael ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Re: Elecraft Digest, Vol 8, Issue 10
Mychael Morohovich wrote: The method I used was to first tune the antenna with my KAT100 for a flat SWR, tune the counterpoise for max current at the rig, then tweak both until the KAT100 reported a flat SWR for the antenna while the Artificial Ground reported maximum current into the counterpoise. Using the rf sensor, I measured the current of the antenna [and counterpoise because I was curious] at a spot close to the back of the rig. I then removed the counterpoise, retuned the antenna for a flat SWR, and measured the current again for reasons of comparison. This showed me the amount of current that was going into a properly tuned antenna both with and without a tuned counterpoise in place. Think of the antenna and everything connected to the ground terminal of the KAT100 -- including the counterpoise -- as an off-center fed antenna. When you removed the counterpoise, you moved the feedpoint. This changed the impedance seen by the KAT100 (which is why you had to retune it) as well as the current measured at the feedpoint. If (for example) the current at this point decreased, how do you know it didn't increase somewhere else along the wire? -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] A big thankyou
Hi all, I would just like to take the time for a moment and thank Ron, AC7AC for his support and assistance in helping me get my XV144 working recently. As usual, I went about things the hard way and decided to run the transverter at low level from the KX60V. As it happened, the documentation had not yet caught up with the process and I got in a muddle. Ron was there immediately and his help was invaluable to me in getting the whole thing working. It is now working like a dream in exactly the way I wanted. Many thanks Ron! Ian -- Ian Maude G0VGS Morecambe Lancs UK | [EMAIL PROTECTED] Sysop of GB7MBC, the Morecambe Bay Cluster Running Linux and DXSpider | K2 #4044 Find out about Summits on the Air! Visit the SOTA web site at http://www.sota.org.uk ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] OT-Preserving CW memories
From time to time I make a post reminding folks that there's a web site where the content comes from a submarine radio operator (www.zerobeat.net/submarine) . I'd love to do a similar site with the memories and stories of folks who made their living pounding brass, whether aboard ship, at a Coast Station, Police Communications, Railroard or other venues. Yep...it appears that hardly anyone does any of the above now, and I'd like to preserve your memories on the web so that those of use that use and enjoy cw have a frame of reference other than amateur radiowhen you're not around, you'll take those memories with you. If ya have a mind to, drop me an emailI'll be happy to turn it into HTML and devote as much space on the server as it takes to tell the story of the magical music. 73,Thom-k3hrn www.zerobeat.net Home of QRP Web Ring, Drakelist home page, Free Classified Ads for amateur radio, QRP IRC channel Elecraft Owners Database www.tlchost.net/ Web Hosting as low as 3.49/month ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] Re: #4472 made my first Rtty contact with my K2
Finally got the K2 SSB kit to work and my first contact was with ZS6PVT, South Africa, on rtty at 5 watts. He had a hard time hearing me, but we exchanged reports fb. What a radio, thanks to all. Jerry, N2UZ ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] Search on archives ?
Ok...I'm sure this is going to be a bonehead question but I can't figure out HOW to search the Elecraft archives. I hate to post a question I have regarding the Control Board on the K2 that I'm sure has been answered in previous posts but I cannot figure out how to use a search on the archives found here: http://mailman.qth.net/pipermail/elecraft/ Sri es Tnx for any help. 72/73 Ann AB1DR ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] Marote 2.1 released
Minor upgrade. Thanks to all the great user feedback! - Added a CW keyboard feature - Now saves the active macro filter file with the other settings - F keys can be used to send your CW macros I also tried some things that did not work. I have not included them. Hehe. Merry Christmas all! Mike AB6CV ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Search on archives ?
>From www.elecraft.com follow the "eMail List" link, then the "Daily list archives...Searchable" link to end up at http://www.ac6rm.net/mailarchive/html/elecraft-list/. I'm sure you will be able to figure it out from there! 73 Paul ZL3IN - Original Message - Ok...I'm sure this is going to be a bonehead question but I can't figure out HOW to search the Elecraft archives. ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
